/* adjust the opacity and */
.code-list  pre {
	opacity:0.5; 
}

/* background color of emphasized lines*/
.code-list .code-selected pre{
	opacity:1;
background-color:aliceblue; 
	/*other colors: LemonChiffon, bisque, aliceblue, BlanchedAlmond*/
}

/* the left border color: gutter */
.code-list li{
	border-left:3px solid;
	border-left-color:#6ce26c; /* change color as you like */
}

/* color of selected line number */
ol.code-list li.code-selected::before {
	color:#006699;   /*other colors  #4169E1  #006699*/
}